US3922079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical multiple projector
Assignee: Lindaco Ltd
•
Filing: 1973-09-07
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Granted: 1975-11-25
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Expires: 1993-09-07
Abstract
Abstract There is provided an optical multiple projector comprising a projection system of overhead type, the table of which is transparent, and a TV-set, the picture screen of which is arranged under the table. The projector may further comprise a diascopic projection system and a frosted glass plate, on which an intermediate picture from the diascopic projector may be watched by the operator, and on which particulars may be pointed out.
Inventors
- 👤 Jan-Erik Astero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:50
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; G03B21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
Projection apparatus of the overhead type, comprising a TVset having a picture tube surface arranged horizontally, a mirror positioned above said picture tube surface, for deflecting light from said picture tube surface, and a lens system for projecting the image of the picture tube surface onto a screen, said projector including a table, said TV-set being normally positioned below said table, mounted on a support, said table at its top side being provided with a frosted sheet of transparent material for the transmission of opaque pictures and full size transparencies through said lens system, light means for illuminating said frosted sheet from a position above said surface, a film projector or diascopic projector arranged to create an intermediate image on said frosted sheet, a mirror being arranged for deflecting the light from said film projector or diascopic projector to provide said intermediate image on said frosted sheet, said intermediate image being projected on said screen through said lens system, means for supporting the film projector or diascopic projector in a position below the table, and means for moving the TV-set to a position remote from the frosted sheet.
Claim 2
Dependent Claim
188 words
Projection apparatus of the overhead type, comprising a TVset having a picture tube surface arranged horizontally, a mirror positioned above said picture tube surface, for deflecting light from said picture tube surface, and a lens system for projecting the image of the picture tube surface onto a screen, said projector including a table, said TV-set being normally positioned below said table, mounted on a support, said table at its top side being provided with a frosted sheet of transparent material for the transmission of opaque pictures and full size transparencies through said lens system, light means for illuminating said frosted sheet from a position above said surface, a film projector or diascopic projector arranged to create an intermediate image on said frosted sheet, a mirror being arranged for deflecting the light from said film projector or diascopic projector to provide said intermediate image on said frosted sheet, said intermediate image being projected on said screen through said lens system, means for supporting the film projector or diascopic projector in a position below the table, and means for moving the TV-set to a position remote from the frosted sheet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |